Midterm 1 (Written by Alexandra Markus)

Midterm 1 (Written by Alexandra Markus) - Name: _ Total:...

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Name: __________________ Total: ___/100 Ψ Midterm 2010 MULTIPLE CHOICE (20 Questions, 4 marks each) 1. Which of the following does not illustrate a function of proteins? a) Enzyme β -lactamase catalyzes the hydrolysis of lactose in the digestive system. b) The sliding filament model for muscle contraction that depends on the presence of Ca 2+ c) The hormone norepinephrine is released at the sympathetic nerve endings in response to this midterm d) Microfilaments form the cytoskeleton serve as scaffolding for a cell, preserving its shape e) The cell membrane consists of a hydrophobic core, which prevents charged, polar molecules from entering the cell. 2. -Leu-Val-Leu-Thr-Leu-Ile- could have been extracted from which of the following? I. An EF hand II. A coiled coil III. A random coil IV. A zinc finger V. A fibrous protein a) I and II b) I and III c) II and III d) II and V e) III and V 3. Which of the following is true about RNA? I. It lacks an oxygen molecule on the 2’ carbon that DNA has II. It is less stable than DNA III. It is the only part of the primer synthesized by exclusively by primase IV. It can be found both in the nucleus and in the cytosol. V. Helicase forms a transcription bubble in order for it to be transcribed from a DNA template a) I and III b) I, II, and III c) I, II, and IV d) II, III, and IV e) II, III, and V
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4. Place the following discoveries in chronological order: 1. McClintock discovers DNA transposons in corn. 2. Gulland discovers that the bases were involved in H-Bonds 3. Watson and Crick discover the 3-dimensional structure of DNA using X-Ray Crystallography 4. Chargoff discovered that the ratio of Purines to Pyrimidines is 1:1 a) 1-2-3-4 b) 1-2-4-3 c) 3-2-4-1 d) 3-4-2-1 e) 2-1-4-3 5. Dr. Evil decides to perform an experiment on DNA. He cuts a sample of the B.Evil gene using the restriction endonuclease EcoR1 . He then inserts the excised DNA into a vacuum. Which of the following is the most plausible explanation for what he sees after performing X-Ray Crystallography? a) He will likely notice that the helix has denatured into two separate strands, especially if the segment is A-T rich. b) He will notice that the segment has coiled into B DNA, as it is a right-handed helix with alternating major and minor grooves. c) He will notice that the segment has compressed into A DNA, as it has shifted into a left-handed helix and has a shorter distance between the bases. d) He will notice that the segment has compressed into A DNA, as it is a right-handed helix that has a shorter distance between the bases, e) He will notice that the segment has compressed into Z DNA, as it is a left-handed helix with a zig-zag backbone and alternating purines and pyrimidines. f) He will notice that the segment has compressed into Z DNA, as it is a right-handed helix with a
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Midterm 1 (Written by Alexandra Markus) - Name: _ Total:...

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